Supplemental Inflatable Restraint (SIR)

CIRCUIT DESCRIPTION
The DERM monitors the ground driver output by comparing the output state to the processor commanded state. DTC 61 will set when the commanded state does not match the output state of either ground driver at terminal "A1" or terminal "A10." A possible cause for a DTC 61 is an open in the Force Low" circuit.

TEST CONDITIONS
Tested every 100 milliseconds during "Continuous Monitoring."

FAILURE CONDITIONS
DTC 61 will set if: Voltage at "Sense Low" input is greater than a certain voltage and feedback from ground driver (QDM) does not agree with the commanded state for 500 milliseconds.

ACTION TAKEN
DERM attempts to turn "ON" the "INFL REST" warning lamp.

CONDITIONS TO CLEAR
Current DTC 61 will be cleared each time the ignition switch is turned "OFF."

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks for proper resistance of the 100 ohm resistor in the resistor module.
2. This test checks for an open in the "Force Low" circuit.